Well, the theatrical poster was really cool. They never seem to use it for the home video release.

No kidding, the painted poster illustration is amazing.

Eastman and Laird's heart was in the right place for TMNT 3, but they just didn't have the right creative crew backing them up. The idea was to not make the same mistake and rush another sequel. It was supposed to be more in the tone of the first movie with the time travel stuff.